Retry TFVC Gets

[damccorm]

Add in retries on Tfvc gets to fix https://dev.azure.com/mseng/AzureDevOps/_workitems/edit/1717568/. We can add it in more places as needed

[lg2de]

We can add it in more places as needed

How about adding it to "git clone" too?

We often hit the following issue:

##[section]Starting: Initialize job
Current agent version: '2.153.1'
##[debug]Primary repository: ***. repository type: Git
Prepare build directory.
##[debug]Delete existing build directory: 'C:\agent\_work\3'
##[debug]Deleting build directory: 'C:\agent\_work\3'
##[error]The directory is not empty : 'C:\agent\_work\3'
##[debug]System.IO.IOException: The directory is not empty : 'C:\agent\_work\3'
   at System.IO.FileSystem.RemoveDirectoryInternal(String fullPath, Boolean topLevel, Boolean allowDirectoryNotEmpty)
   at System.IO.FileSystem.RemoveDirectory(String fullPath, Boolean recursive)
   at System.IO.DirectoryInfo.Delete()
   at Microsoft.VisualStudio.Services.Agent.Util.IOUtil.DeleteDirectory(String path, Boolean contentsOnly, Boolean continueOnContentDeleteError, CancellationToken cancellationToken)
   at Microsoft.VisualStudio.Services.Agent.Worker.Build.BuildDirectoryManager.CreateDirectory(IExecutionContext executionContext, String description, String path, Boolean deleteExisting)
   at Microsoft.VisualStudio.Services.Agent.Worker.Build.BuildDirectoryManager.PrepareDirectory(IExecutionContext executionContext, RepositoryResource repository, WorkspaceOptions workspace)
   at Microsoft.VisualStudio.Services.Agent.Worker.Build.BuildJobExtension.InitializeJobExtension(IExecutionContext executionContext, IList`1 steps, WorkspaceOptions workspace)
   at Microsoft.VisualStudio.Services.Agent.Worker.JobExtension.InitializeJob(IExecutionContext jobContext, AgentJobRequestMessage message)
##[section]Finishing: Initialize job

Running build on the machine once again, the action can be completed.
It is unclear when this happens. It is not yet reproducible.
Already discussed here: https://developercommunity.visualstudio.com/content/problem/598106/build-fails-frequently-with-the-directory-is-not-e.html